gather
翕 centers on bringing things together into one place: gathering, collecting, or assembling. The single given meaning "gather" is the core idea.
翕 combines 合 (to join, fit together) and 羽 (feathers, wings), suggesting the idea of wings folding together or gathering. The exact historical development is uncertain, but the component combination likely reinforces the meaning of gathering or closing.
合 on top means to join or fit together, and 羽 at the bottom means feathers or wings. Picture a bird folding its wings together, gathering them close to its body.
For キュウ, imagine a bird gathering its wings and letting out a soft "cue" sound: cue -> キュウ, as the wings come together.